2008 NOV 10 - (VerticalNews.com) -- "In this paper we discuss the bandwidth enhancement that can be achieved in multi-joule optical parametric chirped pulse amplification (OPCPA) systems exploiting the tunability of parametric amplification," researchers in Frascati, Italy report.

  "In particular, we consider a pair of single pass amplifiers based on potassium-dideuterium-phosphate (DKDP), pumped by the second harmonic of Nd:glass and tuned to amplify adjacent regions of the signal spectrum. We demonstrate that a bandwidth enhancement upto 50% is possible in two configurations; in the first case, one of the two amplifiers is operated near its non-collinear broadband limit; to allow for effective recombination and recompression of the outgoing signals this configuration requires filtering and phase manipulation of the spectral tail of the amplified pulses," wrote F. Terranova and colleagues ...read more

  2008 NOV 10 - (VerticalNews.com) -- "We have studied electromagnetically induced transparency (EIT) spectra in a frequency span as wide as 300 MHz," investigators in Bangalore, India report.

  "This tunability of EIT spectra provides an opportunity to utilize the sub-natural spectra in measuring unknown laser frequency very accurately. EIT is observed when control and probe laser frequency detunings are equal," wrote S.M. Iftiquar and colleagues ...read more

  2008 NOV 10 - (VerticalNews.com) -- "In this paper, based on a system composed of a multimode emitted laser diode and a single-mode received laser, chaos synchronization performance has been investigated numerically under different optical injection patterns," scientists in Chongqing, People's Republic of China report.

  "The results show that, for single mode injection (SMI) which means the received laser is injected by a selective longitudinal mode of the multimode emitted laser whose wavelength corresponds to that of the single-mode received laser, the system synchronization performance is better than that with multi mode injection (MMI); depending on the optical spectrum of the received laser, the physical mechanism of chaos synchronization deterioration for MMI is given. Additionally, after taking into account the parameter mismatches, the chaos synchronization performance of the system with different injection pattern have also been discussed," wrote Q. Yang and colleagues, Southwest University ...read more